books.google.com.br - We are all familiar with the everyday notion of two-sided symmetry, as viewed for example in the external form of the human body. But in its broadest interpretation symmetry is a property which involves regularity and repetition. In this sense symmetry can be found everywhere, especially in science and...http://books.google.com.br/books/about/Symmetrie.html?hl=pt-BR&id=rU8jvsJMKsgC&utm_source=gb-gplus-shareSymmetrie
